18. c3c4  18... g4g3 Arjun is optimistic as always. 19. f2g3  19... h4g3  20. h2h3 The kingside is closed and looks well protected, while the g3-pawn is hanging, White can play c4-c5 and Black's king has nowhere to go. But there's also the other side of the coin: Black may have the chance to sac a bishop on h3, and the knight can travel to f4.